Abstract
Three perceptual tasks, the estimation of visual ‘numerousness’, visual acuity and the auditory detection of a signal in noise, were used to show the effects of various kinds of training. Comparisons were made between simple practice, knowledge of results, cuing techniques and the use of easier material. Cuing was found to be equivalent to, or better than, knowledge of results, and training on easy material was least successful. It is tentatively concluded that the reinforcement paradigm is not appropriate for these perceptual skills and that a simple association principle is adequate.

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